CVE-2026-96655: Plex Media Server Server-Side Request Forgery (SSRF) Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 20 Oct 2026, 27 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 1.6%
EPSS score, percentile 76.2 of all scored records
- How severe?
- 5.3 Medium
CVSS v4.0 base score, given by the CNA
- What should I do?
Required action (CISA), due 3 Nov 2026: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- Which versions are affected?
Affected: before 1.43.3.10861
Unaffected: 1.43.3.10861
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA due date for this action: 3 November 2026.
Advisories and patches
Linked from CISA's catalog entry
- https://forums.plex.tv/t/important-security-update-for-plex-media-server-v1-43-2-and-earlier/942319
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- https://nvd.nist.gov/vuln/detail/CVE-2026-96655
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | before 1.43.3.10861 |
| Unaffected | 1.43.3.10861 |
Versions not listed are: unknown.
Versions the record lists as unaffected: 1.43.3.10861.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
Plex Media Server contains a server-side request forgery (SSRF) vulnerability that could allow an authenticated user to request arbitrary internal or external addresses via the '/video/:/transcode/universal' path parameter. This vulnerability can be chained with CVE-2026-96652, CVE-2026-96654, and CVE-2026-96656.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2026-96655 to its Known Exploited Vulnerabilities (KEV) catalog on 20 Oct 2026.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 3 Nov 2026.
- The CVE record was published on 23 Sep 2026, 27 days before it was added to KEV.
- The CVE record carries a CVSS v4.0 base score of 5.3 (Medium), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 1.6% (percentile 76.2), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact partial.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
Description
Plex Media Server arbitrary-host SSRF
Plex Media Server before 1.43.3.10861 allows an authenticated user to request arbitrary internal or external addresses via the '/video/:/transcode/universal' path parameter.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
- CWE-918: Server-Side Request Forgery (SSRF)
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 23 Sep 2026 | CVE record published |
| 20 Oct 2026 | Added to CISA KEV |
| 21 Oct 2026 | CVE record last updated |
| 3 Nov 2026 | CISA due date for the required action |
References
More exploited Plex vulnerabilities
- CVE-2026-96652: Plex Media Server Server-Side Request Forgery (SSRF) Vulnerability
- CVE-2026-96654: Plex Media Server Improper Neutralization of Encoded URI Schemes in a Web Page Vulnerability
- CVE-2026-96656: Plex Media Server External Control of File Name or Path Vulnerability
- CVE-2020-5741: Plex Media Server Remote Code Execution Vulnerability